Thanks for the translation.
So, the church, in their infinite wisdom, decided that the best course of action was to put the demon king's soul/psyche in the saintess' body. Headless chickens, the bunch of them. They deserve whatever is coming to them.
Or rather, this crapsack world can't burn down soon enough. I don't even think there's any catharsis available at the end of the story. Forget about watching a train wreck in slow motion, we're right after it has already happened, here to count the bodies and despair at the slaughter. If this is the average for a grimdark story, then I think I'll stick to nobledark. At least, there I can still afford to hope.